Photoelectric EffectMedium
Question
Light coming from a discharge tube filled with hydrogen falls on the cathode of the photoelectric cell. The work function of the surface of cathode is 4eV. Which one of the following values of the anode voltage (in volts) with respect to the cathode will likely to make the photo current zero ?
Options
A.- 4
B.- 6
C.- 8
D.- 10
Solution
Maximum photon energy = 13.6 eV (emitted)
So Kmax = 13.6 - 4 = 9.6 eV
Hence stoping potential is - 9.6 V
So - 10V can stop
So Kmax = 13.6 - 4 = 9.6 eV
Hence stoping potential is - 9.6 V
So - 10V can stop
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